Glad to hear you are enjoying MA Time. Sorry to hear about the sound problems you are encountering. Can you send me an Apple System Profiler report with the details of your system configuration (save a report, StuffIt, then attach to e-mail message to
mbabin@orderndev.com)? Additionally, can you tell me if you have external speakers attached? If so, are they USB speakers?
As to "deselecting" a fish, there currently is no way to do so, short of setting the fish selections to something other than random. We're considering ways to allow you to weight/rate the fish so they show up more or less often (depending on the weighting) when selected to fill a random slot (right now, they are all equally weighted). No time frame to announce on when or if such a feature will be included, but it is under consideration.
If you don't care for the particular set of fish chosen to fill your random selection slots, you can hit the spacebar twice (like a double-click, but using the spacebar instead) to have a new set of fish selected.